import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class NewRoute extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return Scaffold(
      appBar: AppBar(
        title: Text("New Route"),
      ),
      body: Center(
        child: Text("this is a new route"),
      ),
    );
  }
}

class CounterWidget extends StatefulWidget {
  const CounterWidget({Key key, this.initValue = 0});

  final int initValue;

  @override
  _CounterWidgetState createState() => new _CounterWidgetState();
}

class _CounterWidgetState extends State<CounterWidget> {
  int _counter;
  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    _counter = widget.initValue;
    print("initState");
  }

  @override
  Widget build(BuildContext context) {
    print("build");
    return Scaffold(
      body: Center(
        child: FlatButton(
          child: Text('$_counter'),
//点击后计数器自增
          onPressed: () => setState(() => ++_counter),
        ),
      ),
    );
  }

  @override
  void didUpdateWidget(covariant CounterWidget oldWidget) {
    // TODO: implement didUpdateWidget
    super.didUpdateWidget(oldWidget);
    print("didUpdateWidget");
  }

  @override
  void deactivate() {
    // TODO: implement deactivate
    super.deactivate();
    print("deactivate");
  }

  @override
  void dispose() {
    // TODO: implement dispose
    super.dispose();
    print("dispose");
  }

  @override
  void reassemble() {
    // TODO: implement reassemble
    super.reassemble();
    print("reassemble");
  }

  @override
  void didChangeDependencies() {
    // TODO: implement didChangeDependencies
    super.didChangeDependencies();
    print("didChangeDependencies");
  }
}

class TipRoute extends StatelessWidget {
  TipRoute({
    Key key,
    @required this.text, //接受一个text参数
  }) : super(key: key);

  final String text;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("提示"),
      ),
      body: Padding(
        padding: EdgeInsets.all(18),
        child: Center(
          child: Column(
            children: <Widget>[
              Text(text),
              RaisedButton(
                onPressed: () => Navigator.pop(context, "我是返回值"),
                child: Text("返回"),
              )
            ],
          ),
        ),
      ),
    );
  }
}

class RouterRouteTest extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: RaisedButton(
        onPressed: () async {
          var result = await Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) {
                return TipRoute(
                  text: "我是提示xxxxx",
                );
              },
            ),
          );
          print("路由返回值：$result");
        },
        child: Text("打开提示页"),
      ),
    );
  }
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
        // This makes the visual density adapt to the platform that you run
        // the app on. For desktop platforms, the controls will be smaller and
        // closer together (more dense) than on mobile platforms.
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class TapboxA extends StatefulWidget {
  TapboxA({Key key}) : super(key: key);
  @override
  _TapboxAState createState() => new _TapboxAState();
}

class _TapboxAState extends State<TapboxA> {
  bool _active = false;
  void _handleTap() {
    setState(() {
      _active = !_active;
    });
  }

  @override
  Widget build(BuildContext context) {
    return new GestureDetector(
      onTap: _handleTap,
      child: new Container(
        child: new Center(
          child: new Text(_active ? 'Active' : 'Inactive',
              style: new TextStyle(fontSize: 32.0, color: Colors.white)),
        ),
        height: 200.0,
        width: 200.0,
        decoration: new BoxDecoration(
            color: _active ? Colors.lightGreen[700] : Colors.grey[600]),
      ),
    );
  }
}

class ParentWidget extends StatefulWidget {
  bool _active = false;

  @override
  _ParentWidget createState() => new _ParentWidget();
}

class _ParentWidget extends State<ParentWidget> {
  bool _active = false;

  void _handleTapboxChanged(bool newValue) {
    setState(() {
      _active = newValue;
    });
  }

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new Container(
      child: new TapboxB(
        active: _active,
        onChanged: _handleTapboxChanged,
      ),
    );
  }
}

class TapboxB extends StatelessWidget {
  TapboxB({Key key, this.active: false, @required this.onChanged})
      : super(key: key);

  final bool active;
  final ValueChanged<bool> onChanged;

  void _handleTap() {
    onChanged(!active);
  }

  @override
  Widget build(BuildContext context) {
    return new GestureDetector(
      onTap: _handleTap,
      child: new Container(
        child: new Center(
          child: new Text(active ? 'Active' : 'Inactive',
              style: new TextStyle(fontSize: 32.0, color: Colors.white)),
        ),
        height: 200.0,
        width: 200.0,
        decoration: new BoxDecoration(
            color: active ? Colors.lightGreen[700] : Colors.grey[600]),
      ),
    );
  }
}

class ParentWidgetC extends StatefulWidget {
  @override
  _ParentWidgetCState createState() => new _ParentWidgetCState();
}

class _ParentWidgetCState extends State<ParentWidgetC> {
  bool _active = false;

  void _handleTapboxChanged(bool newValue) {
    setState(() {
      _active = newValue;
    });
  }

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return new Container(
      child: new TapboxC(
        active: _active,
        onChanged: _handleTapboxChanged,
      ),
    );
  }
}

class TapboxC extends StatefulWidget {
  TapboxC({Key key, this.active: false, @required this.onChanged})
      : super(key: key);
  final bool active;
  final ValueChanged<bool> onChanged;

  @override
  _TapboxCState createState() => new _TapboxCState();
}

class _TapboxCState extends State<TapboxC> {
  bool _highlight = false;

  void _handleTapDown(TapDownDetails details) {
    setState(() {
      _highlight = true;
    });
  }

  void _handleTapUp(TapUpDetails details) {
    setState(() {
      _highlight = false;
    });
  }

  void _handleTapCancel() {
    setState(() {
      _highlight = false;
    });
  }

  void _handleTap() {
    widget.onChanged(!widget.active);
  }

  @override
  Widget build(BuildContext context) {
    return new GestureDetector(
        onTapDown: _handleTapDown,
        onTapUp: _handleTapUp,
        onTap: _handleTap,
        onTapCancel: _handleTapCancel,
        child: new Container(
          child: new Center(
            child: new Text(widget.active ? 'Active' : 'Inactive',
                style: new TextStyle(fontSize: 32.0, color: Colors.white)),
          ),
          height: 200.0,
          width: 200.0,
          decoration: new BoxDecoration(
              color: widget.active ? Colors.lightGreen[700] : Colors.grey[600],
              border: _highlight
                  ? new Border.all(color: Colors.teal[700], width: 10.0)
                  : null),
        ));
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
            FlatButton(
              child: Text("open new route"),
              textColor: Colors.blue,
              onPressed: () {
                Navigator.push(context, MaterialPageRoute(builder: (context) {
                  return NewRoute();
                }));
              },
            ),
            FlatButton(
              child: Text("打开提示页"),
              textColor: Colors.blue,
              onPressed: () {
                Navigator.push(context, MaterialPageRoute(builder: (context) {
                  //return RouterRouteTest();
                  //return CounterWidget();
                  //return TapboxA();
                  return ParentWidget();
                }));
              },
            ),
            FlatButton(
              child: Text("状态管理demo"),
              textColor: Colors.blue,
              onPressed: () {
                Navigator.push(context, MaterialPageRoute(builder: (context) {
                  //return RouterRouteTest();
                  //return CounterWidget();
                  //return TapboxA();
                  return ParentWidgetC();
                }));
              },
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}
